Method of making plaster bases and the product thereof



May 11 1937- -w. F. SCHULZ 2,079,819 l METHOD OF MAKING PLASTER BASES AND THE PRODUCT THEREOF Filed Oct. '7. 1935 Patented May 11, 1937 PATENT OFFICE METHOD or* MAKING PLASTER BASES AND THE PRODUCT THEREoF Walter F. Schulz, Youngstown, Ohio, assigner to Truscon Steel Company, Youngstown, Ohio, a corporation of Michigan Application October 7, 1935, Serial No. 43,963

6 Claims.

rIhe prsent invention relates to that type of plaster base using a metal fabric as the lath and a paper' or like sheet as the backing or foundatiori sheet. 4

The object herein is to provide a structure in Which the sheet is reenforced by the employment of metal fabric on opposite sides, and to so secure this fabric that there are no large openings pre-formed in the sheets.

A further and important object is to provide a structure made up of expanded metal, that thus gives a unitary metallic cover and reenforcement for the sheet which will not stretch or move with respect to the sheet.

Still a further object is to provide a method of constructing the plaster base so that an effective union is obtained between the two metal fabric sheetsfand no large sized openings are needed to insure the union, the method moreover being simple and easily performed.

In the accompanying drawing:

Figure 1 is a side elevation of a portion of a plaster base constructed in accordance with the present invention.

Figures 2, 3, 4 and 5 are, respectively, cross sectional Views taken on the lines 2 2, 3 3, 4 4 and 5 5 of Figure 1.

According to the present disclosure, a foundation sheet G of paper is employed, which for the most successful work, is comparatively thin, approximately .005 of an inch in thickness. Two sheets of diamond mesh expanded metal fabric I and 8 overlie the opposite faces of the sheet, with their strands, respectively designated 9 and Ill, disposed in parallel relation, but offset one from the other, or out of register. The strands of the two sheets are thus arranged in crossed relation, and at certain of the intersections they are pressed together and electrically welded, as at Il.

The metal sheets are thus effectively secured together and bind the sheet of paper 6 rmly between them. After being united, coatings of water-proof material, shown at l2, are preferably sprayed or otherwise applied over the opposite faces of the product, substantially covering the same, and not only keeping the metal from rusting, but preventing the penetration of the moisture into and through the sheet.

In the method of production, and as will be clear especially by reference to Figure 3, when =the portionsof the metal sheets at their crossing are pressed together in the welding operation, the edges of the strands being diagonally disposed, have a tendency to cut into the paper (Cl. l2-116) and the heat of the Welding operation destroys the paper at the juncture of the metal, so that openings are formed in the sheet. These openings, however, are very small and do not extend for any considerable distance around the welds. 5 Indeed they partake of the general contour of the metal junctures, and after the welding operation it is actually difficult to locate where the welding connections have been made.

The result is a product of great strength with 10 a foundation seat held relatively taut, and yet thin so that inexpensive material may be employed, but sufcient to hold the plaster that is applied to either or both faces.

From the foregoing it is thought that the con- 15 struction, operation and many advantages of the herein described invention will be apparent to those skilled in the art Without further description, and it will be understood that various changes in the size, shape, proportion and minor 20 details of construction may be resorted to Without departing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. A plaster base comprising a foundation 25 lsheet, a sheet of expanded metal fabric overlying one face of the foundation sheet, a fabric overlying the opposite face of the foundation sheet, connections through the foundation sheet between the expanded metal fabric and the said 30 fabric sheet, and a substantially waterproof coating over at least one face of the foundation sheet and the expanded metal overlying the same.

2. A plaster base comprising a foundation sheet, diamond mesh expanded metal fabric over- 35 lying opposite faces of the sheet, the strands of the expanded metal fabric on opposite sides being out of register, certain of said opposite strands at their crossing points being welded together through the foundation sheet and the openings 40 in the foundation sheet formed at said welding points being formed by the welding action and being substantially of the size and shape of the welded portions passing through them, and a substantially Waterproof coating covering the op- 45 posite faces of the foundation sheet and the overlying sheets of expanded metal fabric.

3. 'Ihe method of securing metal fabric to the opposite sides of a foundation sheet of dielectric material which consists in Welding the fabric together through the sheets and forming the openings for the welds by said welding action.

4. The method of securing metal fabric to the opposite sides of a foundation sheet which consists in applying metal fabric to opposite sides of a foundation sheet of dielectric material, pressing together and welding said fabric at certain points, and causing the welding action to make openings in the sheet to bring the fabric on opposite sides thereof into welding contact.

5. The method of securing metal fabric to the opposite sides .of a foundationsheet. of dielectric materialv which consists in placing. sheets of expanded metal fabric on opposite sides of a founda- 10 tion sheet with certain portions in direct oppo sition, pressing said portions together and creating a welding action between them. that. .burns openings in the foundation sheet and secures a welding action between the metalportions.

burning the sheet between and causing the metal 10 at the crossings to contact and Weld together.

WALTER F. SCHULZ. 

